Adhesive joint.



C. C. BLAKE.

ADHESIVE JOHN.

APPLICATION FILED NOV. 13. 1915. RENEWED APR. w. 590%? To all whom itmay concern:

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a GHAELIES C. BLAKE, 0F BROOKLINE, MASSACI-TUSETTS, ASSIGNOR T0 C. C.BLAKE INCQRPURATED, 0F BOSTON, MASSACHUSETTS. A CORPORATION OF NEW YORK.

ADHESIVE JOINT.

Specification of Letters Patent. v

Patented Nov. 13.2, 19118.

Application filed November 13, 1915, Serial No. 61,381. Renewed April10, 1918. Serial No. 227,824.

Be it known that 1', CHARLES C. BLAKE, a citizen of the United States,residing at Brookline, in the county of Norfolk and State ofMassachusetts, have invented a new and useful Improvement in AdhesiveJoints, of which the following is a specification.

The present invention relates to adhesive joints by means of whichseparate pieces of material are connected. I

In one method of making adhesive joints the parts to be joined arecoated with a liquid "adhesive and then the coated parts are pressedtogether until the joint is made.

This method is wasteful of the adhesive and -.also causes considerableannoyance owing r a normally non-tacky adhesive,' press the partstogether, and render the adhesive tacky by the application of heat to,one or both of the exposed surfaces of the parts. While. the secondmethod is abetter method than the first method for many uses the secondmethod cannot be employed as the application of heat to the exposedsurfaces of the parts to be joined damages the material. A

In the method of lasting shoes devised by me the upper is first updrawn,then the updrawn upper is bound and clamped against the edge face of thesole on the last, and finally a coating of liquid cement is interposedbetween the edge face of the sole and the upper for the purpose ofsecuring the upper to the edge face of the sole. In order to effect aneconomy in the use of the cement and also to obviate all danger ofsoiling the upper of the shoe it has been proposed to provide the edgeface of the sole with a coating of the type hereinbefore referred towhich is normally non-adhesive under ordinary conditions of temperaturebut which is capable ofbeing rendered tacky under the infiu'encof heat.After the upper was upcation of heat to its exposed face so that thepractice of this method had to be abandoned.

The object of the present invention is to provide a novel adhesivejoint, having all the advantages of the second adhesive jointhereinbefore referred to, which may be formed without injury to thematerials of appended claims, which possess advantages readily apparentto those skilled in the art.

The various features ofthe resent invention will be best understood 'roman in spection of the accompanying drawings illustrating the best formof the. invention at present known to the inventor, in which,

Figure 1 is a plan of an insole for a welt shoe which is to be connectedto' an upper; Fig. 2 is a lateral sectional elevation of the insole; andH a Fig. 3 is a lateral sectional elevation of a lasted welt shoe.

Referring now to the drawings an insole l is provided along its edgeface with a coating 2 (Figs. 2 and 3) in which is em- -bdpled aconductor 3, hereinafter termed a thermal conductor,- for transmittingforce, such as heat or electricity. While the thermal conductor may be atube for transmitting steam, hot air or otherheating medium it'ispreferred to employ a wire of heatprodup'ing resistance for conductingelectricity; The coating may be jewelers cement, sealing wax or someother of the well known normally non-tacky adhesives all of which arenon-conductors. The insole is secured to a last in the usual way, or inaccordance with the method described in the application for LettersPatent of the United States, filed by me September 16, 1915, Serial No.51,099, and an upper 4 is then updrawn in the manner illustrated in Fig.3.

becomes red hot whereupon the coating 2 is rendered tacky thus making ati lg}; joint between the insole and upper Wit is adhesive ioint theheat 1s applied directly to gift the contacting faces of the parts to bejoined thus obviating all danger of damage resulting to thematerial ofthe parts. As the wire employed is very fine it may be allowed to remainin the joint with safety.

While the illustrated embodiment of the present invention is directed toan improved adhesive joint for connecting the upper and sole of a shoeit is not to be understood as limiting the scope of the claims, wherethe 'sentials, the features whereof are definitely statled in their truescope in thejclaims herewlt What is claimed as new, is

1. In combination, two members having interposed therebetween anadhesive which is normally non-adhesive'but which is rendered tackyunder the influence of heat anda thermal conductor for melting theadhesive to join the members, substantially as described.

2. In combination, two members having thermal conductor, the adhesivebeing normally non-adhesive but rendered tacky under the influence ofheat conducted by the conductor, substantially as described.

3. An adhesive joint, I comprising two members having an adhesive ontheir contactin faces, and a source of heatapplied direct y to thecontacting faces of the members, substantially as described.

4. A. sole having an adhesive coating which is normally non-adhesive butwhich is rendered tacky under the influence of heat thereon and a wireembedded 1n the adhesive coating, substantially as described. f

non-adhesive but which is rendered tacky under the influenc of heat anda thermal conductor, substantia 1y as described.

7. An assembled shoe, havlng, 1n comb1nation, a sole and an upper havinginterposed therebetween anadhesive-covered thermal conductor, theadhesive being normally non-- adhesive but rendered tacky under theinfluence of heat conducted by the conductor, substantially asdescribed. v

8. A lasted shoe, having, in combination, a sole provided with anadhesive which is normally non-adhesive but which is ren' dered tackyunder the influence of heat and -a thermal conductor, and an uppersecured to the sole by the adhesive, substantially as described. a

9. A lasted shoe, having, in combination, a sole provided along its edgeface with-an adhesive which is normally non-adhesive but i which isrendered tacky under the influence of heat and a thermal conductor, andan upper secured to theedge face of the sole by vthe adhesive,substantially as described.- lnterposed therebetween an adhesive-covered10. A sole having its edge face coated with an adhesive which isnormally non-adhesive but which is rendered tacky under the influence ofheat and a'thermal conductor embeddedin the adhesive, substantially asde scribed. v

'11. A sole having a solid edge face'coate'd with an adhesive which isnormally non-adhesive but which is rendered tacky under the influence ofheat, and a wire embedded.

in the adhesive, substantially as described.

' CHARLES C, BLAKE.

Copies of this patent may be obtained for five cents each, by addressingthe Gommissioner of Patents,

Washington, in. c.

